John Nagle wrote:
> aditya wrote:
>> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>>>>>> To get the decimal representation of a binary number, I can just do
>>>> this:
>>>> int('11',2) # returns 3
>>>> But decimal binary numbers throw a ValueError:
>>>> int('1.1',2) # should return 1.5, throws error instead.
>>>> Is this by design? It seems to me that this is not the correct
>>>> behavior.
>>> The int() constructor returns integers.
>>> So, look to float() for non-integral values.
>>> Binary representation isn't supported yet,
>>> but we do have hex:
>>>>>> >>> float.fromhex('1.8')
>>> 1.5
>>>>>> Raymond
>>>> That looks very elegant, thanks!
>> Hex floats are useful because you can get a string representation
> of the exact value of a binary floating point number. It should
> always be the case that
>> float.fromhex(float.hex(x)) == x
>> That's not always true of decimal representations, due to rounding
> problems.
>Floats have a limited length, unlike ints which are virtually unlimited.
> Long discussion of this here: "http://bugs.python.org/issue1580"
>